Numerical investigation into the decoupling effects of hydrogen blending on flame structure and soot formation in a laminar ethylene diffusion flame |
| |
| Affiliation: | 1. Department of Mechanical and Industrial Engineering, University of Toronto, 5 King''s College Road, Toronto, Ontario M5S 3G8, Canadan;2. Department of Applied Mechanics and Project Engineering, University of Castilla-La Mancha, Spain;1. University of Toronto Institute for Aerospace Studies, 4925 Dufferin Street, Toronto, Ontario M3H 5T6, Canada;2. Department of Aerospace Engineering, Ryerson University, 350 Victoria St., Toronto, Ontario M5B 2K3, Canada;1. Centre for Energy Technology (CET), The University of Adelaide, S.A. 5005, Australia;2. School of Mechanical Engineering, The University of Adelaide, S.A. 5005, Australia;3. School of Chemical Engineering, The University of Adelaide, S.A. 5005, Australia |
| |
| Abstract: | Numerical calculations were conducted to explore the various effects of hydrogen blending on flame properties and soot behaviors in an ethylene coflow diffusion flame, based on a fully step-by-step decoupling method, by introducing several virtual species into the gas-phase mechanism. Results show that the concentration of OH increases under the chemical effect of hydrogen due to an enhanced rate of H2 + O ↔ OH + H. The soot yield, primary number density, and average primary number per aggregate decrease under dilution effect while these increase under chemical effect. The enhancements of hydrogen-abstraction-carbon-addition (HACA) rates and polycyclic aromatic hydrocarbon (PAH) condensation rates are responsible for soot mass addition under chemical effect. Both the oxidation rates by O2 and OH are delayed under the chemical effect because of lower concentrations of O2 and OH in the sooting zone. The overall effect of higher surface growth rates and delayed oxidation rates results in an increased soot volume fraction (SVF). |
| |
| Keywords: | Hydrogen blending Ethylene coflow diffusion flame Flame properties Soot behaviors Fully decoupling method |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
